Transcript 218 Halogens - Philip Rogers Elementary School

The Halogens
Group 17 on the Periodic Table
By Christine Ngo, Kristal
Espana, Rebecca Odusola,
Jeremy Bekkouche
The
Halo
gens
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Group
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ofClick
nonmetals
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Second level
All elements in this Third
group
are reactive
level
Fourth level
Fifth level
Fluorine, Chlorine, Bromine, Iodine and
Astatine are all in the halogens group.
Fl
uo
rin
e
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Gas at room
temperature and
extremely reactive
Isolated by Henri
Moissan in 1886
Can be found in
toothpaste and in
water systems
where they help to
prevent tooth
decay
Chlor
ine
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Greenish-yellow
gas with a
noticeable odor
In high
concentration it will
be toxic
Was used in World
War I as a poison
gas
Prepared by
Scheele in later
1700, proved tobe
an element by
Davy in 1810
Used in swimming
pools to get rid of
any bacteria
Brom
ine
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Reddish-brown fuming
liquid with a chlorine-like
smell.
Isolated in pure form by
Balard in 1826.
Only non-metal that is
liquid at normal room
conditions.
Can cause painful burns
that heal slowly when
applied on the skin.
Used for
dyes,disinfectants,and
photographic chemicals.
Iodin
e
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It was discovered in
1811 by Curtis
Dark gray solid with
a faint metallic luster
When heated, it turns
to a violet gas
Important element in
the human diet
Crucial for a properly
working thyroid gland
Used in table salt
Used medically for
the thyroid and
anything that has to
deal with that gland.
Astat
ine
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Last of the known
halogens in 1940
by Corson and
others at the
university in
California.
It is radioactive and
its name, from the
Greek astatos,
means “uristable”
Astatine is
expected to react
like others
halogens but less
active
Should be a tiny
quantities of
astatine in the